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The influence of the magnetic field on the free convective flow of a viscous fluid past a hot vertical porous plate is analysed under the assumptions that the suction velocity which is normal to the porous wall is constant and the wall temperature is spanwise cosinusoidal. The solutions for the velocity, temperature, skin friction and rate of heat transfer have been obtained in dimensionless form by perturbation technique. The effects of different flow parameters appearing in the solutions have been studied on the above flow quantities.